限时训练1
高考英语 Unit 2 Growing pains限时规范训练1
Ⅰ.单项填空(共 15 小题；每小题 1 分，满分 15 分)1．The enemy had no choice but ________ their arms and ________.A．lie down；give in B．lay down；give into lay down；give in D．to lie down；to give in 答案： C [have no choice but 后接带 to 的不定式，且 and 与不定式之间存在并列关系。
lay down one’s arms 是“放下武器”之意。
]2．In order to look after her sick mother，she asked for a month’s ________.A．holiday B．leave D．rest答案： C [holiday 与 vacation 指“度假”，而 leave 指因事(病)而请的假。
]3．________ alone in a dark room，the little girl was so frightened as to cry loudly.A．Left C．Being left D．To be left答案： B [此题考查非谓语动词。
由于 leave 与句子主语 the little girl 是被动关系，所以应该用过去分词作状语。
]4．—Why can’t you and Bill go to the movies tonight?—We are ________ a history test tomorrow.A．supposed to having B．supposedly to havesupposed to have D．supposedly to having答案： C [答语意为“我们明天应有历史测验”。
be supposed to do 为固定词组，意为“理应做”。
直线运动 限时训练1
直线运动限时训练1一、单选13. (2010年海南卷)下列说法正确的是()A．若物体运动速率始终不变，则物体所受合力一定为零B．若物体的加速度均匀增加，则物体做匀加速直线运动C．若物体所受合力与其速度方向相反，则物体做匀减速直线运动D．若物体在任意的相等时间间隔内位移相等，则物体做匀速直线运动14.（2011年重庆）某人估测一竖直枯井深度，从井口静止释放一石头并开始计时，经2s听到石头落地声，由此可知井深约为（不计声音传播时间，重力加速度g取10m/s2）A.10mB. 20mC. 30mD. 40m15. （2013年广东）某航母跑道长200m.飞机在航母上滑行的最大加速度为6m/s2，起飞需要的最低速度为50m/s.那么，飞机在滑行前，需要借助弹射系统获得的最小初速度为A.5m/sB.10m/sC.15m/sD.20m/s16.（2011年天津）质点做直线运动的位移x与时间t的关系为x = 5t + t2（各物理量均采用国际单位制单位），则该质点A．第1s内的位移是5m B．前2s内的平均速度是6m/sC．任意相邻1s内的位移差都是1m D．任意1s内的速度增量都是2m/s二、双选17．在同一地点，甲、乙两个物体沿同一方向作直线运动的速度一时间图象如图所示，则A．两物体相遇的时间是2S和6SB．乙物体先在前运动2S，随后作向后运动C．两个物体相距最远的时刻是1S末和4S末D．4s-6s内乙在甲前面18．甲、乙两车某时刻由同一地点沿同一方向开始做直线运动，若以该时刻作为计时起点，得到两车的x－t图象如图所示，则下列说法正确的是A．t1时刻乙车从后面追上甲车B．t1时刻两车相距最远C．t1时刻两车的速度刚好相等D．0到t1时间内，乙车的平均速度等于甲车的平均速度19．甲、乙两物体的v －t 图象如图所示，则A.甲、乙两物体都做匀速直线运动B.甲、乙两物体若在同一直线上，就一定会相遇C.甲的速率大于乙的速率D ．甲、乙两物体若在同一直线上，就一定不会相遇20．在防恐军事演习中，某空降兵从飞机上跳下，先做自由落体运动，在t 1时刻，速度达到较大值v 1时打开降落伞，做减速运动，在t 2时刻以较小速度v 2着地，他的速度图象如图所示．下列说法正确的是A.在0～t 1内，该空降兵的平均速度v ＝v 12B.在t 1～t 2内，该空降兵的平均速度v ＝v 1＋v 22C ．在t 1～t 2内，该空降兵的平均速度v ＞v 1＋v 22D ．在t 1～t 2内，该空降兵的平均速度v ＜v 1＋v 2221．如图所示(t 轴单位为s)，有一质点，当t ＝0时从原点由静止开始出发，沿直线运动，则A ．t ＝0.5 s 时离原点最远B ．t ＝1 s 时离原点最远C ．t ＝1 s 时回到原点D ．t ＝2 s 时回到原点（2010年广东高考）（1）图13是某同学在做匀变速直线运动实验中获得的一条纸带。
【练习】2021届高三英语下学期限时训练一有详解
高三英语限时训练一总分65分第一部分：阅读理解（共两节，满分30分）第一节（共7个小题：每小题2.5分，满分17.5分）AWhat do the random, scribbled(潦草的)drawings crowding the margins(页边空白)of most high school students’ papers mean? When a student is caught doodling(乱画)in class, he will probably be criticized for daydreaming. But doodling while listening can help with remembering details, rather than implying that the mind is wandering, according to a study published in the scientific journal Applied Cognitive Psychology.In an experiment conducted b y the Medical Research Council’s Cognition and Brain Sciences Unit in Cambridge,40 subjects were asked to listen to a two-minute tape giving several names of people and places. Half of the participants were asked to shade in shapes on a piece of paper at the same time, without paying attention to neatness, while the rest were given no such instructions. After the tape had finished, all participants in the study were asked to recall the names of people and places. The doodlers recalled on average 7.5 names of people and places, compared to only 5.8 by the non-doodlers.“If someone is doing a boring task, like listening to a dull telephone conversation, they may start to daydream.” said study researcher, Professor Jackie Andrade, of the School of Psychology, U niversity of Plymouth. “Daydreaming distracts them from the task, resulting in poorer performance. A simple task, like doodling, may be enough tostop daydreaming without affecting performance on the main task.”“In psychology, tests of memory or attention will often use a second task to selectively block a particular mental process. If that process is important for the main task, then performance will be weakened. But my research suggests that in everyday life doodling may be something we do because it helps to keep us on track with a boring task, rather than being an unnecessary distraction(分心)that we should try to resist doing.” said Andrade.Dan Ware, a social study teacher, used to consider doodling a distraction from learning, but after teaching kids with all personality types he learned scribbling away during lectures helps certain students remember more information. “In my first few years of teaching, I thought, ‘Well, this kid isn’t paying attention. He’s daydreaming.’ But I had some really powerful experiences with students and came to understand in many cases that was their way of focusing, and those students were probably paying more attention than other students.” Ware said.1. What do we know about the participants involved in the experiment?A. Some were asked to note down the information neatly.B. Some were asked to memorize the names they would hear.C. Some were instructed to listen to the tape with full attention.D. Some were instructed to make random drawings on paper.2. Which of the following will both Jackie Andrade and Dan Ware agree with?A. Doodling helps some people focus.B. Doodling makes a dull task interesting.C. Students who doodle perform poorly.D. Students who doodle lack concentration.3. What is the best title of the text?A. Daydreaming Can Sharpen Study SkillsB. Doodling Can Help Memory RecallC. A Wandering Mind Improves ProductivityD. Distractions Harm Academic PerformanceBShyness is the cause of much unhappiness for a great many people. Shy people are anxious and self-conscious; that is, they are concerned about their own appearance and actions too much. Negative thoughts are constantly occurring in their minds: What kind of impression am I making? Do they like me? Do I sound stupid? Am I wearing unattractive clothes?It is obvious that such uncomfortable feelings must affect people unfavorably. A person’s self-concept is reflected in the way he or she behaves and the way a person behaves affects other people’s reactions. In general, the way people think about themselves has a deep effect on all areas of their lives.Shy people, who have low respect, are likely to be passive and easily influenced by others. They need faith that they are doing ＂the right thing＂. Shy people are very sensitive to criticism. It makes them feel inferior(自卑). They also find it difficult to be pleased by praises because they believe they are unworthy of praise. A shy person may respond to a praise with a statement like this one: ＂You’re just saying that to make me feel good. I kn ow it’s not true.＂It is clear that, while self-awareness is a healthy quality, overdoing it is harmful.Can shyness be completely got rid of, or at least reduced? Fortunately, people can overcome shyness with determination since shyness goes hand in hand with lack ofself-respect. It is important for people to accept their weaknesses as well as their strengths. Each one of us has his or her own characteristics. We are interested in our own personal ways. The better we understand ourselves, the easier it becomes to live up to our chances for a rich and successful life.4. The first paragraph is mainly about ____________. .A. the cause of shynessB. the effect of shyness on peopleC. the feelings of shy peopleD. the questions in the minds of shy people5. According to the writer, self-awareness is ____________.A. harmful to peopleB. a weak point of peopleC. the cause of unhappinessD. a good characteristic6. What is the shy people’s reaction to praise?A. They are pleased by it. B They feel it is not true.C. They are very sensitive to it.D. They feel they are worthy of it.7. We can learn from the passage that shyness ____________.A. blocks our chances for a successful lifeB. helps us to live up to our full developmentC. enables us to understand ourselves betterD. has nothing to do with lack of self-respect第二节七选五（共5小题，每小题2.5分，满分12.5分）根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。
限时语基训练一 短语结构类型
限时语基训练一短语结构类型一、写出六种短语结构类型。
1. 并列短语2. 偏正短语3. 动宾短语4. 后补短语5. 主谓短语6. 介宾短语二、指出下列短语的结构类型。
风俗习惯（并列短语）变化规律（偏正短语）正当此时（介宾短语）整修一新（后补短语）交头接耳（并列短语）思维敏捷（主谓短语）废寝忘食（并列短语）前程远大（主谓短语）全神贯注（主谓短语）心胸豁达（主谓短语）按照习惯（介宾短语）愚公移山（主谓短语）竞选州长（动宾短语）销售计划（偏正短语）色彩缤纷（主谓短语）交通规则（偏正短语）风和日丽（并列短语）激动不已（后补短语）禁止吸烟（动宾短语）辛勤耕耘（偏正短语）巍峨挺立（并列短语）不断发生（偏正短语）气氛热烈（主谓短语）继往开来（后补短语）三、比较并判断下列短语的结构类型。
经济发展（主谓短语）历史悠久（主谓短语）描写景物（动宾短语）市场繁荣（主谓短语）发展经济（动宾短语）悠久历史（偏正短语）景物描写（偏正短语）市场的繁荣（偏正短语）表达见解（动宾短语）我的弟弟（偏正短语）我国文学（偏正短语）小说散文（并列短语）表达的见解（偏正短语）我和弟弟（并列短语）我国的文学（偏正短语）小说和散文（并列短语）四、在划线短语后面的括号中标注其结构类型。
1. 在这呼吸不息（主谓短语）的地方，蚊子竟无从插嘴，居然睡安稳了（后补短语）。
2. 在这广漠的人海里（介宾短语）独自混了二十多年，没有一个人管束过我（动宾短语）。
3. 我的童年没有幽默，只有从荒寒的大自然感应到一点生命最初的快乐和梦幻（偏正短语）。
4. 这副劳动者的忧郁面孔上笼罩着消沉的阴影（动宾短语），滞留着愚钝和压抑（并列短语）。
5. 我感觉到有无数无形的线条（偏正短语）正穿梭在我和其他人的心灵中间（后补短语）。
6. 孩子们呵着冻得通红（后补短语），像紫芽姜一般的小手，七八个一齐来塑雪罗汉（动宾短语）。
7. 在这暗无天日的时候（偏正短语），一切都睡着了（主谓短语），都沉在梦里（后补短语）。
2021届江苏省常州市金沙高级中学高三下学期限时训练(一)英语试题(解析版)
江苏省常州市金沙高级中学2021届高三下学期限时训练（一）英语试题第一部分：阅读理解（共两节，满分30分）第一节（共7个小题：每小题2.5分，满分17.5分）AWhat do the random, scribbled(潦草的)drawings crowding the margins(页边空白)of most high school students’ papers mean? When a student is caught doodling(乱画)in class, he will probably be criticized for daydreaming. But doodling while listening can help with remembering details, rather than implying that the mind is wandering, according to a study published in the scientific journal Applied Cognitive Psychology.In an experiment conducted by the Medical Research Council’s Cognition and Brain Sciences Unit in Cambridge,40 subjects were asked to listen to a two-minute tape giving several names of people and places. Half of the participants were asked to shade in shapes on a piece of paper at the same time, without paying attention to neatness, while the rest were given no such instructions. After the tape had finished, all participants in the study were asked to recall the names of people and places. The doodlers recalled on average 7.5 names of people and places, compared to only 5.8 by the non-doodlers.“If someone is doing a boring task, like listening to a dull telephone conversation, they may start to daydream.” said study researcher, Professor Jackie Andrade, of the School of P sychology, University of Plymouth. “Daydreaming distracts them from the task, resulting in poorer performance. A simple task, like doodling, may be enough to stop daydreaming without affecting performance on the main task.”“In psychology, tests of memory or attention will often use a second task to selectively block a particular mental process. If that process is important for the main task, then performance will be weakened. But my research suggests that in everyday life doodling may be something we do because it helps to keep us on track with a boring task, rather than being an unnecessary distraction(分心)that we should try to resist doing.” said Andrade.Dan Ware, a social study teacher, used to consider doodling a distraction from learning, butafter teaching kids with all personality types he learned scribbling away during lectures helps certain students remember more information. “In my first few years of teaching, I thought, ‘Well, this kid isn’t paying attention. He’s daydreaming.’ But I had some real ly powerful experiences with students and came to understand in many cases that was their way of focusing, and those students were probably paying more attention than other students.” Ware said.1. What do we know about the participants involved in the experiment?A. Some were asked to note down the information neatly.B. Some were asked to memorize the names they would hear.C. Some were instructed to listen to the tape with full attention.D. Some were instructed to make random drawings on paper.2. Which of the following will both Jackie Andrade and Dan Ware agree with?A. Doodling helps some people focus.B. Doodling makes a dull task interesting.C. Students who doodle perform poorly.D. Students who doodle lack concentration.3. What is the best title of the text?A. Daydreaming Can Sharpen Study SkillsB. Doodling Can Help Memory RecallC. A Wandering Mind Improves ProductivityD. Distractions Harm Academic PerformanceBShyness is the cause of much unhappiness for a great many people. Shy people are anxious and self-conscious; that is, they are concerned about their own appearance and actions too much. Negative thoughts are constantly occurring in their minds: What kind of impression am I making? Do they like me? Do I sound stupid? Am I wearing unattractive clothes?It is obvious that such uncomfortable feelings must affect people unfavorably. A person’s self-concept is reflected in the way he or she behaves and the way a person behaves affects other people’s reactions. In general, the way p eople think about themselves has a deep effect on all areas of their lives.Shy people, who have low respect, are likely to be passive and easily influenced by others. They need faith that they are doing ＂the right thing＂. Shy people are very sensitive to criticism. It makes them feel inferior(自卑). They also find it difficult to be pleased by praises because they believe they are unworthy of praise. A shy person may respond to a praise with a statement like this one: ＂You’re just saying that to make me feel good. I know it’s not true.＂It is clear that,. while self-awareness is a healthy quality, overdoing it is harmful.Can shyness be completely got rid of, or at least reduced? Fortunately, people can overcomeshyness with determination since shyness goes hand in hand with lack of self-respect. It isimportant for people to accept their weaknesses as well as their strengths. Each one of us has hisor her own characteristics. We are interested in our own personal ways. The better we understandourselves, the easier it becomes to live up to our chances for a rich and successful life.4. The first paragraph is mainly about ____________.A. the cause of shynessB. the effect of shyness on peopleC. the feelings of shy peopleD. the questions in the minds of shy people5. According to the writer, self-awareness is ____________.A. harmful to peopleB. a weak point of peopleC. the cause of unhappinessD. a good characteristic6. What is the shy people’s reaction to praise?A. They are pleased by it. B They feel it is not true.C. They are very sensitive to it.D. They feel they are worthy of it.7. We can learn from the passage that shyness ____________.A. blocks our chances for a successful lifeB. helps us to live up to our full developmentC. enables us to understand ourselves betterD. has nothing to do with lack of self-respect第二节（共5小题，每小题2.5分，满分12.5分）根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。
2020年广东中考英语阅读理解限时训练(一)PDF版有答案(2)
2020年广东中考英语阅读理解限时训练（一）AAre you learning English and do you need help with grammar?Do you want to learn new vocabulary?Well,try to get help from the following top five free English learning centers online.Dave's ESL CafeOur center can help you learn and practice English.You can read many stories and do a lot of exercises to test yourself.You can also post questions and answers onto the Learners'Corner.Classroom by Voice of AmericaYou can watch videos and listen to news stories to improve your listening and vocabulary.You can also listen to English words and their meanings.About EnglishYou can take free English courses in our center,and you'll get regular(定期的)emails that will help you learn English.Newbury House Dictionary of American English Do you need to find the definition(定义)of a word?Use this online dictionary to find simple and clear definitions,as well as example sentences and idioms(习语)．You can also find different cultural facts.Personal English Portal(门户网站)on YouTube We offer you series(系列)of videos to develop your listening skills.You can also do a search on YouTube to find other videos.This is a good way to practice English and have fun.()1.Linda is interested in Dave's ESL Cafe.What can she do in the center?A．Watch videos.B．Listen to news stories.C．Find the meanings of words.D．Post questions and answers.()2.From Newbury House Dictionary of American English，what can you find?A．Example sentences and idioms.B．English songs.C．English grammar exercises.D．Many videos.()3.About English often sends emails to its visitors to help them ________.A．get relaxed B．have funC．become famous D．learn English()4.If you want to develop your listening skills and have fun，you can go to________.A．Newbury House Dictionary of American EnglishB．YouTubeC．Dave's ESL CafeD．the Classroom by V oice of America()5.Where may we read the above information?A.In the science fiction.B．In a newspaper.C.In a story book.D．In a science report.BNo matter who you are and where you live，the most important thing is what kind of person you are.There are many good qualities(品质)that can benefit you a lot in your life.Among them，the following qualities are the most helpful ones.Have a positive attitude(态度).Life is not always a bed of roses. When you face difficulties，don't lose heart.Do you know what can help you overcome difficulties?It's your attitude.Cheer up！Life is like a mirror.When you smile in front of it，it will also smile at you.Keep learning.Maybe you are used to your present life.Every day you have so much work to do that you can't find any time to learn. However，the world around you is changing all the time.Never be satisfied with yourself，or you will fall behind others.Keeping learning can help you get success in the future.Be creative.In the modern world，the students who have creative thinking are needed most.Being creative means coming up with new ideas and having creative imagination.Those who are creative have more choices in their life.Be honest and keep your promise.Honesty is the best policy(原则). Nobody likes a person who tells lies.The one who keeps his words is popular everywhere.As long as you have these qualities mentioned above，you will be excellent and make a difference to the world.Albert Einstein once said，“Try not to become a man of success but rather try to become a man of value.”()6.From the passage，we know that_____can help you overcome difficulties.A.rosesB.attitudeC.mirrorsD.learning ()7.The underlined word“benefit”probably means____in Chinese in this passage.A.影响B.补贴C.有益D.救济()8.In the writer's opinion，there are_____qualities that can benefit you most in your life.A.threeB.fourC.fiveD.six ()9.Which of the following is NOT true according to the passage？A.Since there is too much work to do，you needn't find time tolearn.B.If you think creatively，you will have more chances to choosein your life.C.When you keep your words，you usually promise to do whatyou have said.D.Albert Einstein thought we should become a man of value.()10.Which one might be the best title of this passage？A.Keeping Your PromiseB.Being a Man of SuccessC.Trying to Think CreativelyD.The Most Helpful Qualities of a ManAMany students find it difficult to learn English.Some of them even want to give up.They wonder how they can learn it well.Here are four English classes in Yucai Training Center.Have a look,maybe they can help you to improve it.Class 1:For speaking Time:7：30p ．m.—9：30p ．m.everyTuesday Teacher:John Smith (the USA)Price:￥150for a monthIntroduction:In this class,you will learn how to talk with others in English and how to sing English songs.Class 2:For reading Time:8：00p ．m.—10：00p ．m.on Mondays Teacher:Jeff Green (the UK)Price:￥180for 6weeks Introduction:We'll tell you some useful reading strategies and skills.Some for daily reading and some for exam reading.Class 3:For listening Time:7：00p ．m.—8：30p ．m.onWednesdays Teacher:Lin Tao (CHN)Price:￥100for 3weeksIntroduction:This class will give you some helpful advice to practice listening.Class 4:For writing Time:7：00p ．m.—9：00p ．m.every Thursday Teacher:Rose (Australia)Price:￥120for 4weeks Introduction:Rose is an experienced teacher.She has her special ways for you to improve your writing.She is also here to be your pen pal.For more information,you can read tomorrow's newspaper or contact (联系)Mr.Zheng at 07696653221or email him at yucai @ .2020年广东中考英语阅读理解限时训练（二）()1.There is(are)________class(es)for you to improve your English in Yucai Training Center.A．one B．twoC．three D．four()2.If you want to join all the classes in this training center,you should pay________for them.A．￥150B．￥180C．￥220D．￥550()3.________will teach Mr.Chen to improve his speaking.A．John Smith B．Jeff GreenC．Lin Tao D．Rose()4.You can read this advertisement________.A．in a storybook B．in a newspaperC．in a magazine D．on the Internet()5.Which is the correct order for the class in Yucai Training Center according to the time you can join in?①Class1:For speaking②Class2:For reading③Class3:For listening④Class4:For writingA．①②③④B．②①③④C．②①④③D．③④②①BPinyin,a system that uses the Latin letters,tells us how to pronounce Chinese characters.What you learned in your first Chinese class in primary school was probably pinyin.The year2018marks pinyin's sixtieth birthday.In1958,Chinese linguist(语言学家)Zhou Youguang and his team designed pinyin.Before that,Chinese people used many other methods to denote(标注)the pronunciation of Chinese characters.In ancient China, people denoted Chinese characters using other Chinese characters that had the same pronunciation.Some of the symbols are Chinese character strokes(笔画)．For example,a vertical stroke(一竖)pronounced as“i”in pinyin.Some people in Taiwan still use this method.However,these methods are not as simple as pinyin.Because of pinyin,many illiterate(不识字的)people have learned how to read.We use pinyin to type Chinese characters into computers and phones.Pinyin has been useful in other ways,too.It helps to promote the use of Standard Chinese,or Mandarin, so people who speak different dialects(方言)can still understand each other.Pinyin is not only popular in China.Many people around the world start to learn Chinese by learning pinyin.You might say“nihao”instead of “hello”to a foreign friend.The Oxford English Dictionary(《牛津英语词典》)includes more than100Chinese words in pinyin,such as zhongguomeng for“Chinese dream”，and wanggou for“online shopping”．Pinyin is not only a language tool,but also a cultural bridge that connects China to the world,Guangming Daily noted.Pinyin is still young.But it has been and will still be a useful tool in the future.()6.The underlined word“promote”in the second paragraph may mean“________”in the passage.A．解释B．改善C．表达D．介绍()7.Paragraph2mainly tells us about________.A．the history of pinyin B．the designers of pinyinC．the problems of pinyin D．the future of pinyin()8.The writer talks about the Oxford English Dictionary to tell us ________.A．pinyin is popular only in ChinaB．pinyin is popular all over the worldC．pinyin will not be used in the futureD．English will be replaced(代替)by pinyin()9.We can learn from the passage________.A．pinyin has been used since ancient ChinaB．people in Taiwan prefer to use pinyinC．pinyin is useful in many waysD．we will not use pinyin in the future()10.We can infer from the passage that the writer feels________ about the future of pinyin.A．doubtful B．unsureC．hopeful D．sad2020年广东中考英语阅读理解限时训练（三）AHello,lovely boys and girls.I would like to introduce our English language holidays for you.As English is one of the most widely spoken languages in the world，millions of people look forward to studying English abroad(在国外)during holidays.English language holidays are taken in Englishspeaking countries like England，the USA，Australia and so on.There，you study in a language school with students from many different countries.You live with local(本地的)people，and often stay with a host family.The English language holiday has become a very popular way of learning English because it has many advantages.●Constant Experience(持续的体验)Because you are in an Englishspeaking country，from the time you wake up and have breakfast with your host family until late evening，you have no opportunity to escape the English language.●Mixed(混合的)ClassesOn a language holiday，students come from all over the world.It is possible that nobody in your class will speak your language，so you will just have to speak English.●Free From PressureOn a language holiday，you may forget the everyday pressure of school.You feel more relaxed and you can learn easily.●Cultural UnderstandingLearning a language is not only about learning words.Different countries have different cultures.People think and behave(表现)differently.By visiting and living in a foreign country，you learn to understand the culture and the people，and so understand the language better.If you want to know more about it,don't forget to attend our introduction meeting on time.It will be held at eight tomorrow morning in our school hall.You won't realize its advantages until you experience it by yourself.()1.The followings are all Englishspeaking countries EXCEPT ______according to the passage.A.EnglandB.the USAC.RussiaD.Australia()2.While you are having an English language holiday，you cannot ______.A.just do what you likeB.study in a language schoolC.stay with a host familyD.live with local people()3.What does the underlined word“escape”mean in Chinese?A.教育B.逃避C.表达D.进去()4.The number of advantages of English language holidays is ______.A.oneB.twoC.threeD.four()5.What's the best title of this passage?A.English language holidays.B.English language holidays are popular.C.The advantages of English language holidays.D.The disadvantages of English language holidays.BDo you know what smart phones can do for us?We can make phone calls，take photos，call a Didi Taxi，send short messages or emails，check emails，surf the Internet and watch videos almost anywhere.Especially，smartphone shopping has become more and more popular in our life because people can buy almost everything they need there.You are wondering how to shop on smartphones?Let me show you.If you live in the central part of the city,and you need to buy some fresh grapes from the east of the city,you can use your smartphone.To start with，all you need to do is download a shopping app(应用程序)and find a suitable store you like.Shopping on the smartphone has a lot of advantages，of which the most important is perhaps its convenience.People don't have to waste a lot of energy and time to go from one shop to another to choose things they like.This is especially good for the old，the sick and the busy people who cannot go to the shops by themselves.However，shopping on the smartphone also has its disadvantages. The first disadvantage is that people can't see the goods or try them on by themselves.Sometimes，the real goods may not be the same as what they have seen on the smartphone.The second disadvantage is that some shops on the Internet are not registered(登记的).They will never deliver(递送)anything to you after they get the money from you.Once you are cheated，you will find that you have nowhere to go to complain(投诉).()6.Smartphone shopping has become more and more popular in our life because______.A.we can take photos and send short messagesB.we can buy almost everything we needC.we can check emails and surf the InternetD.we can make phone calls and call a Didi Taxi()7.If you want to shop on smartphones，you should______at first.A.go to the storeB.find a suitable storeC.send emails to the shopD.download a shopping app()8.What does the underlined word“convenience”mean in Chinese?A.麻烦B.方便C.舒适D.交流()9.The number of disadvantages of shopping on smartphones is ______.A.oneB.twoC.threeD.four()10.What's the best title of this passage?A.Smartphone shopping.B.The usages of smartphone shopping.C.The advantages of smartphone shopping.D.The disadvantages of smartphone shopping.AHow winter weather influences the subway serviceWhen temperatures drop,and ice and snow fall on the tracks,know more service changes by:☆listening to your local traffic broadcasts☆visiting our website ☆signing up for email or text message warnings on our website☆following us on Twitter(NYCTSubwayScoop)☆calling our travel information line at 718-330-1234Our goal is to keep as many trains in service as possible and to keep you informed.Depending on how bad the weather is,here’s what you can expect:Service on these lines may run local on different parts of their routes:A,E,D,F,N,Q,2,3,4,5Service will change on these lines:G —Service between Court Square and 71st Street will stop for some time.7—Reduced service 11p.m.—1a.m.After 1a.m.normal late night service startsagain.S —*42nd Street train runs all night*Dyre Road trains go farther to 149th Street*Rockaway Park train goes farther to Euclid RoadExpect service on these weekday lines to end earlier than normal:B(take D or Q instead),V(take F instead),W(take N instead)Please allow for more travel time and listen for broadcasts.Thank you.2020年广东中考英语阅读理解限时训练（四）()11.People can know about subway service changes in winter through_____ ways.A.threeB.fouC.fiveD.six()12.The subway website will_____.A.send emails to some passengersB.keep all the underground trains in serviceC.follow the passengers around in the stationD.call the travel information line to know about the changes()13.What service changes there will be depends on_____.A.the weatherB.the seasonC.passengersD.the temperature()14.The service of_____lines will change if necessary.A.tenB.fourteenC.sixteenD.eighteen()15.When Line V ends earlier,passengers can take_____.A.Line7B.Line QC.Line5D.Line FBWould you like to live in a city where buildings turn the lights off for you,and self-driving cars will find the nearest parking space themselves?Although it might sound a little far from you,living in a“smart”city like this could happen sooner than you think.Great changes have taken place in towns that we have lived in for centuries, while completely new cities are being built.One such place is the city of Songdo. Every home there will have a“tele-presence system(远程遥控系统)”allowing users to control the heating and locks,take part in video meetings,and receiveeducation,health care and government services.Around the city,escalators(自动扶梯)will only move when someone is on them,and offices and schools will all be connected to the system.The great mind behind Songdo is from the company Cisco.In fact,technology companies around the world such as IBM,Siemens and Microsoft are already in the business.“About75%of the world’s population will live in cities by2050,so cities will need to be more modern to deal with the coming problems.Making cities smarter is one way out,and I think this will in turn make cities greener,”said Dan Hill, head of a research company.()16.According to the text,living in a“smart”city_____.A.is not a green wayB.will be far from youC.will soon become trueD.is completely impossible()17.The underlined phrase“in turn”means_____in Chinese.A.反过来B.轮流C.依次地D.翻转()18._____offers the great mind to build Songdo.A.CiscoB.IBMC.SiemensD.Microsoft()19.Dan Hill thinks that making cities smarter is one way to_____.A.drive people out of citiesB.control the world’s populationC.develop his own companyD.solve the cities’coming problems()20.Which of the following might be the best title for the text?A.Future EducationB.Smart Citiesernment ServicesD.Famous Companies【参考答案】训练一1-5 D A D B B 6-10 B C B A D 训练二1～5 D D A B B 6～10 D A B C C 训练三1~5C A B D C6~10B D B B A 训练四1-5 C A A C D 6-10 C A A D B。
生物限时训练(1)
1生物限时训练（1）一、选择题：1. 由地震形成的海洋中有大小相似的甲、乙两个小岛，某时间段内小岛上鸟类种类和数量随时间变化的情况如图所示，下列有关叙述中，错误的是：A ．两岛上的鸟类存在地理隔离，不同种的鸟类之间存在着生殖隔离B ．甲岛较乙岛鸟种类增加更多，可能是甲岛的环境变化更大C ．两岛的鸟类各形成一个种群基因库，且两个基因库间的差异越来越大D ．两岛上鸟类的种类虽然不同，但最终两岛上鸟类的数量趋于相同2. BrdU 能替代T 与A 配对，而渗入新合成的DNA 链中。
当用姬姆萨染料染色时，不含BrdU 的链为深蓝色，含BrdU 的链为浅蓝色。
现将植物根尖分生组织放在含有BrdU 的培养液中进行培养，如图a ～c 依次表示加入BrdU 后连续3次细胞分裂中期，来自1条染色体的各染色体的显色情况（阴影表示深蓝色，非阴影为浅蓝色）。
有关说法正确的是：A ．1个DNA 复制3次所产生的DNA 分别位于2条染色体上B ．b 图每条染色体均有1个DNA 的2条脱氧核苷酸链都含BrdUC ．1个染色体形成2条染色单体时，DNA 还没有复制D ．c 图中有2条染色单体的所有脱氧核苷酸链都不含BrdU3. 在小鼠中，有一种叫灰砂色（T ）的基因，位于X 染色体上。
灰砂色“XO 患病”雌鼠与正常灰色（t ）雄鼠交配，预期后代基因型为（胚胎的存活至少要有一条X 染色体）：A ．X T Y 、X T X t 、X tB ．X t Y 、X T X t 、X tC ．X T Y 、Y 、X T X t 、X tD ．X T Y 、Y 、X T X t 4. 在某岛屿上相互隔绝的甲、乙两个水潭中，都生活着小型淡水鱼――虹鳉。
研究发现，甲中的虹鳉（天敌是狗鱼，以大而成熟的虹鳉为食）比乙中的虹鳉（天敌是花鳉，以幼小的虹鳉为食）常常早熟，即在体重较低时就能繁殖后代。
下列观点不正确的是：A ．两个虹鳉种群中都有成熟早或晚的变异类型，这是进化的前提条件B ．甲中的早熟型个体有更多的机会繁殖后代，因而种群中早熟基因的基因频率增加C ．因为甲、乙中的两个虹鳉种群存在地理隔离，所以它们属于不同的物种D ．若将甲中虹鳉和乙中花鳉转移到一个新水潭中共同饲养，多年后虹鳉成熟个体平均体重将会增加5.下面是四种不同质粒的示意图，其中ori为复制必需的序列，amp为氨苄青霉素抗性基因，tet为四环素抗性基因，箭头表示同一种限制性内切酶的酶切位点。
限时训练1
高二物理（创）周考练一、选择题（1、4、10、11、12多选，其他单选）1．下列说法中正确的是()．A．每种金属都有确定的电阻率，电阻率不随温度变化B．导线越细越长，其电阻率也越大C．一般金属的电阻率，都随温度升高而增大D．测电阻率时，为了提高精度，通过导线的电流要足够大，而且要等到稳定一段时间后才可读数2.电位器是变阻器的一种．如图所示，如果把电位器与灯泡串联起来，利用它改变灯的亮度，下列说法正确的是()．A．连接A、B使滑动触头顺时针转动，灯泡变暗B．连接A、C使滑动触头逆时针转动，灯泡变亮C．连接A、C使滑动触头顺时针转动，灯泡变暗D．连接B、C使滑动触头顺时针转动，灯泡变亮3．如图所示是电阻R1和R2的伏安特性曲线，并且把第一象限分为Ⅰ、Ⅱ、Ⅲ三个区域，现在把R1和R2并联在电路中，消耗的电功率分别为P1和P2，并联总电阻设为R.下列关于P1和P2的大小关系及R的伏安特性曲线应该在的区域正确的是()．A．特性曲线在Ⅰ区，P1<P2B．特性曲线在Ⅲ区，P1>P2C．特性曲线在Ⅰ区，P1>P2D．特性曲线在Ⅲ区，P1<P24．某导体中的电流随其两端电压的变化如图7-1-9所示，则下列说法中正确的是()．A．加5 V电压时，导体的电阻约是5 ΩB．加12 V电压时，导体的电阻约是1.4 ΩC．由图可知，随着电压的增大，导体的电阻不断减小D．由图可知，随着电压的减小，导体的电阻不断减小5．两个电阻，R1＝8 Ω，R2＝2 Ω，并联在电路中，欲使这两个电阻消耗的电功率相等，可行的办法是()．A．用一个阻值为2 Ω的电阻与R2串联B．用一个阻值为1 Ω的电阻与R2串联C．用一个阻值为6 Ω的电阻与R1串联D．用一个阻值为2 Ω的电阻与R1串联6.甲、乙两根保险丝均为同种材料制成，直径分别是d1＝0.5 mm和d2＝1 mm，熔断电流分别为2.0 A和6.0 A，把以上两根保险丝各取等长一段并联后再接入电路中，允许通过的最大电流是().A.6.0 A B．7.5 AC.10.0 A D．8.0 A7．如图所示，电源电动势E＝8 V，内电阻为r＝0.5 Ω，“3 V，3 W”的灯泡L与电动机M串联接在电源上，灯泡刚好正常发光，电动机刚好正常工作，电动机的线圈电阻R0＝1.5 Ω.下列说法中正确的是()．A．通过电动机的电流为1.6 AB．电源的输出功率是8 WC．电动机消耗的电功率为3 WD．电动机的输出功率为3 W8．两根材料相同的均匀导线x和y串联在电路中，两导线沿长度方向的电势变化情况分别如图中的ab段和bc段图线所示，则导线x和y的横截面积之比为()．A．2∶1 B．1∶2C．6∶1 D．1∶69．在如图所示的电路中，E为电源，其内阻为r，L为小灯泡(其灯丝电阻可视为不变)，R1、R2为定值电阻，R3为光敏电阻，其阻值大小随所受照射光强度的增大而减小，V为理想电压表．若将照射R3的光的强度减弱，则()．A．电压表的示数变大B．小灯泡消耗的功率变小C．通过R2的电流变小D．电源内阻消耗的电压变大10．如图所示，电源电动势为E，内阻为r，不计电压表和电流表内阻对电路的影响，当电键闭合后，两小灯泡均能发光．在将滑动变阻器的触片逐渐向右滑动的过程中，下列说法正确的是()．A．小灯泡L1、L2均变暗B．小灯泡L1变亮，小灯泡L2变暗C．电流表A的读数变小，电压表V的读数变大D．电流表A的读数变大，电压表V的读数变小11．如图所示，电源电动势为E，内电阻为r，两电表均可看做是理想电表．闭合开关，使滑动变阻器的滑片由右端向左滑动，在此过程中()．A．小灯泡L1、L2均变暗B．小灯泡L1变暗，L2变亮C．电流表A的读数变小，电压表V的读数变大D．电流表A的读数变大，电压表V的读数变小12、如图所示电路中，电源内阻不能忽略，两个电压表均为理想电表．当滑动变阻器R 2的滑动触头P 滑动时，关于两个电压表V 1与V 2的示数，下列判断正确的是( )．A ．P 向a 滑动V 1示数增大、V 2的示数减小B ．P 向b 滑动V 1示数增大、V 2的示数减小C ．P 向a 滑动，V 1示数改变量的绝对值小于V 2示数改变时的绝对值D ．P 向b 滑动，V 1示数改变量的绝对值大于V 2示数改变量的绝对值二、解答题13．两个分别用长l = 5cm 的绝缘细线悬挂于同一点的相同金属小球（可视为点电荷），带有等量同种电荷。
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班级
一、填空题 1. 于 已知函数 f ( x) a 4a 3 的反函数的图象经过点（-1，2） ，那么 a 的值等
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D1 C
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的一个顶点 A 在平面 内，其余顶点在 的同侧，正方体上与顶点 A 相邻的三个顶点到 的距离分别为 1，2 和 4，P 是正方体的其余 四个顶点中的一个，则 P 到平面 的距离可能是：______（写出所 有正确结论的编号） ①3； ②4； ③5； ④6； ⑤7 D
(2)取 OA 的中点 M ，连 EM 、 BM ，则 EM ∥ AC , BEM 是异面直线 BE 与 AC 所成的角.求
1 5 17 AC , BE OB 2 OE 2 5, BM OM 2 OB 2 . 2 2 2 得: BE 2 ME 2 BM 2 2 2 cos BEM ,BEM arccos . 2 BE ME 5 5 EM
14. 表面积为 2 3 的正八面体的各个顶点都在同一个球面上，则此球的体积为（
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A．
2 3
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15. 下列函数中，在其定义域内既是奇函数又是减函数的是（ A. y x 3 , x R B. y sin x , x R C. y x , x R ）
n
.(用数字作答)
4 2 x y 2 13. 若抛物线 y 2 px 的焦点与椭圆 1 的右焦点重合，则 p 的值为（ 1 6 2 y
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A． 2
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D． 4
x
lim(a1 a2 an )
则 OH 面 ABC , OH 的长就是所要求的距离. BC 2 2, OD
OC CD 2.
2 2
OBC , OA OB 、 OA OC ， OA 面则
OA OD.
设平面 ABC 的法向量为 n1 ( x, y, z ), 则由 n1 AB知 : n1 AB 2 x z 0; 由 n1 AC知取 : n1 AC 2 y z 0.
A1
B A
O
.
y f 1 ( x)
3
2. 若复数 z 同时满足 z － z ＝2 i ， z ＝ iz （ i 为虚数单位） ，则 z ＝
．
二、选择题
3. 安排 5 名歌手的演出顺序时，要求某名歌手不第一个出场，另一名歌手不最后一个出场，不同 排法的总数是 4. 数列{ an }满足: a1
k k 1
1
三、解答题 17. 如图，已知三棱锥 O ABC 的侧棱 OA ，， OB OC 两两垂直，且 OA 1 ， OB OC 2 ，
18. 已知函数 f ( x) sin x sin( x (I)求 f ( x) 的最小正周期；
2
), x R .
E 是 OC 的中点．
AD OA2 OD 2 3 ，在直角三角形 OAD 中，有 OH
OA OD 2 6 . AD 3 3
1 1 2 6 （另解：由 V S ABC OH OA OB OC 知, OH .) 3 6 3 3
) sin x cos x 2 sin( x
4
)
2；
3 3 7 7 ，即 sin cos ① 2 sin cos ,即 sin 2 4 4 16 16
4
k 1
2 9. 若曲线 y
10. 是 11.
x
1 与直线 y b 没有公共点，则 b 的取值范围是_________.
S 0
k ≤ 50 ?
若 f ( x) a sin( x
) b sin( x )(ab 0) 是偶函数,则有序实数对( a, b )可以 4 4
1 ，若 f 1 5, 则 f f 5 f x
D. y ( ) x , x R 开始
1 2
16. 如果执行右面的程序框图，那么输出的 S （ Ａ．2450 Ｃ．2550 Ｂ．2500 Ｄ．2652
_______________。 8. 圆 x 2 y 2 4 x 4 y 10 0 上的点到直线 x y 14 0 的最大距离与最小距离的差是
3
结合图形可知,二面角 E AB C 的大小为: arccos 18. 解： f ( x) sin x sin( x
7 6 . 18
2 2 2 ; （Ⅰ） f ( x) 的最小正周期为 T 1
（Ⅱ） f ( x) 的最大值为 2 和最小值 （Ⅲ）因为 f ( )
(3)连结 CH 并延长交 AB 于 F ,连结 OF 、 EF .
n1 OA 2 6 . n1 (1,1, 2) ，则点 O 到面 ABC 的距离为 d 3 11 4 n1 (2) EB (2, 0, 0) (0,1, 0) (2, 1, 0), AC (0, 2, 1).
6 EG 30 30 7 6 sin EFG 6 , EFG arcsin .(或表示为 arccos ) 3 EF 18 18 18 5
方法二:(1)以 O 为原点, OB 、 OC 、 OA 分别为 x 、 y 、 z 轴建立空间直角坐标系. 则有 A(0, 0,1) 、 B (2, 0, 0) 、 C (0, 2, 0) 、 E (0,1, 0).
OC 面又面 OAB, OC AB. OH
ABC , CF AB, EF AB,
1 6 则 EFC 就是所求二面角的平面角.作 EG CF 于 G ,则 EG OH . 2 6
n n1 1 2 4 7 7 6 则 cos < n, n1 > . 18 9 6 3 6 n n1
cos < EB, AC >
2 2 2 , 所以异面直线 BE 与 AC 所成的角 arccos . 5 5 5 5
(3)设平面 EAB 的法向量为 n ( x, y, z ), 则由 n AB 知: n AB 2 x z 0; 由 n EB 知: n EB 2 x y 0. 取 n (1, 2, 2). 由(1)知平面 ABC 的法向量为 n1 (1,1, 2).
在直角三角形 OAB 中, OF
1 i
4.
1 2
OA OB 2 , AB 5
5.－14 在直角三角形 OEF 中, EF
6. d 1
7. f
f 5 f (5) f (1)
1 1 。8. 6 2 9. [－1，1]. f (1 2) 5
5. 在 ( x ) 7 的展开式中， x 2 的系数中__________________（用数字作答） 6. 设 S n 为等差数列 a n 的前 n 项和，若 S 5 10, S10 5 ,则公差为 7. 函数 f x 对于任意实数 x 满足条件 f x 2 （用数字作答） 。
否
.(注:只要填满足 a b 0 的一组数即可)(写出你认为正确的一组数即可). 已知函数 f ( x) 是定义在 ( , ) 上的偶函数. . 当 x ( , 0 ) 时， f ( x) x x 4 ，则当
？ 是
S S 2k
输出 S 结束
x ( 0, ) 时， f ( x)
11. -x-x4．12. 选①③④⑤。
OE 2 OF 2 1
4 3 , 5 5
10. 只要 a+b=0 即可，可以取 a=1，b=－1. 13. D。14. A。15. A. 16. C 17. 解析:.(1)取 BC 的中点 D ,连 AD 、 OD
OB OC , 则OD BC 、 AD BC , BC 面过点作于 OAD. O OH AD H ,
（1）求 O 点到面 ABC 的距离； （2）求异面直线 BE 与 AC 所成的角； （3）求二面角 E AB C 的大小．
Ａ
(II)求 f ( x) 的的最大值和最小值； (III)若 f ( )
Ｏ
Ｅ
Ｃ
3 ，求 sin 2 的值. 4
D1
2
参考答案 1. a＝2 2. Z iZ 2i Z 2i i 1 ；3. 共有 78 种不同排法